Very interesting but this confuses me:
"Studies suggest that calcium, for example, may help people regulate their weight, he says. No one really understands how calcium may do this -- in fact, the theory is controversial. But it could be that a diet high in calcium suppresses a form of vitamin D called calcitriol that revs up fat-burning processes."

So they are saying that calcium is good for weight loss right (or maintaining as opposed to regaining)? If so, then why does it suppress something that "revs up fat-burning processes."?